MQTT problem (Client stop receiving after 20 messages)

Hello Community,
I use the mqtt-mbed library based on the GitHub - ARMmbed/mbed-mqtt: Mbed-os MQTT and MQTT-SN library, based on Eclipse Paho project. and my controller-client (STM F401RE with ESP8266) stops receiving messages exactly after 20 published messages. Has anyone any idea?

Thanks in responce.

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